Aluminium bromide

  • Aluminum (III ) bromide
  • Aluminum tribromide

Shiny, colorless leaflets

Fixed

3.2 g · cm -3

97 ° C

250-270 ° C

1.3 hPa (81 ° C)

  • Explosive decomposition in water
  • Soluble in benzene and toluene

Risk

1598 mg · kg -1 ( LD50, rat, oral)

-516 KJ · mol -1

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Aluminum bromide is an inorganic chemical compound consisting of bromine and aluminum, having the empirical formula AlBr3.

Production and representation

Aluminum bromide can be synthesized on aluminum by passing bromine vapor through a red-hot mixture of carbon and alumina, or by the direct action of bromine.

Properties

The molar mass is 266.69 g / mol, its density 3.2 g / cm ³. It has a melting point of 97.5 ° C and a boiling point of 255.3 ° C.

In the solid state forms of aluminum bromide Al2Br6 molecules in which two bromide act as bridging ligands, with the result that the aluminum atom obtained an electron octet.

Aluminum bromide is soluble in benzene, and many organic solvents. It forms colorless rhombic and fumes in moist air crystals. It has a monoclinic crystal structure (a = 102.0 pm, b = 119.4 pm, c = 64.4 pm, β = 111 °).

Aluminum bromide reacts to form a strongly acidic solution under vigorous reaction with water. Here, the Al- Br bonds are largely hydrolyzed. From the solution crystallized aluminum bromide hexahydrate as AlBr3 · 6 H2O.

Use

The main use of aluminum bromide as a catalyst in organic synthesis, such as polymerization, the Friedel-Crafts reactions and the bromination.

CAS registry number PubChem Vapor pressure Dangerous Substances Directive (67/548/EEC) Aluminium Monoclinic crystal system Hydrolysis Friedel–Crafts reaction Integrated Authority File
42475
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